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nohz: Remove nohz_cpu_mask

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RCU no longer uses this global variable, nor does anyone else.  This
commit therefore removes this variable.  This reduces memory footprint
and also removes some atomic instructions and memory barriers from
the dyntick-idle path.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Shi, Alex 2011-07-28 14:56:12 +08:00 • committed by Paul E. McKenney
commit fc0763f53e
3 changed files with 0 additions and 18 deletions
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include/linux/sched.h
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@ -270,7 +270,6 @@ extern void init_idle_bootup_task(struct task_struct *idle);
extern int runqueue_is_locked(int cpu);
extern cpumask_var_t nohz_cpu_mask;
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
extern void select_nohz_load_balancer(int stop_tick);
extern int get_nohz_timer_target(void);